APA aipamena

Leedy, P. D., Newby, T. J., & Ertmer, P. A. (2001). Practical research: Planning and design (6th ed.). Merrill Prentice Hall.

Chicago Style aipamena

Leedy, Paul D., Timothy J. Newby, and Peggy A. Ertmer. Practical Research: Planning and Design. 6th ed. Upper Saddle River, New Jersey: Merrill Prentice Hall, 2001.

MLA aipamena

Leedy, Paul D., et al. Practical Research: Planning and Design. 6th ed. Merrill Prentice Hall, 2001.